body {
  background-color: rgb(15 23 42);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  padding: 0;
  margin: 0;
  overflow: hidden;
}

#rectangle {
  cursor: crosshair;
  position: absolute;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: black;
  opacity: 0.4;
}
